Bosch Appliances 3.5 manual 7: Connecting a spare amplifier, en, Main, Bosch Security Systems

Praesideo 3.5 Installation and User Instructions 4 Amplifiers

en 140

Main

Mains

										115:
										100-120V	50-60Hz
										T6.3A 250V
										230:
Control In								Audio In		220-240V	50-60Hz
										T6.3A 250V
1	2	3	4	5	6	7	8	1	2	Signal Ground
										Grounded	Floating

+ 0 – + 0

–

Network

2

Control Out

Spare In

Lsp Out

2

Control Out

Spare In

Lsp Out

1

Control Out

Spare In

Lsp Out

4

Control Out

Spare In

Lsp Out

3

1

C NO NC

– – 0V 50V + +

C NO NC

– – 0V 50V + +

C NO NC

– – 0V 50V + +

C NO NC

– – 0V 50V + +

	Class 2				Caution
	Wiring	Battery	48V	12A
48V	48V	Non-isolated input	+	0	Avis

Control Out	Spare In	Lsp Out 1
C NO NC	– – 0V 50V + +

1

Spare

Mains

115:

100-120V

50-60Hz

T6.3A 250V

230:

Control In

Audio In

220-240V

50-60Hz

T6.3A 250V

1

2

3

4

5

6

7

8

1

2

Signal Ground

Grounded

Floating

+ 0 – + 0 –

Network

1

Control Out

Spare In

Lsp Out

2

Control Out

Spare In

Lsp Out

1

Control Out

Spare In

Lsp Out

4

Control Out

Spare In

Lsp Out

3

2

– – 0V 50V + +

– – 0V 50V + +

C NO NC

– – 0V 50V + +

C NO NC

– – 0V 50V + +

C NO NC

C NO NC

	Class 2				Caution
	Wiring	Battery	48V	12A
48V	48V	Non-isolated input	+	0	Avis

Control Out	Spare In	Lsp Out 1
C NO NC	– – 0V 50V + +

2

figure 8.7: Connecting a spare amplifier

	Spare In +
100 V	Lsp Out +
1
70 V	50 V
50 V
	Spare In -
	Lsp Out -
	0 V
100 V	Spare In +
	Lsp Out +
2
70 V	50 V
50 V
	Spare In -
	Lsp Out -
	0 V

figure 8.8: Power amplifier, before spare switching

At the moment the main amplifier (1) goes down, the relay is de-energized and the switches fall into their default positions: Spare In - and Spare In + (see figure 8.9). This means that the audio output of the spare amplifier (2) is routed to the loudspeaker line through the main amplifier (1). The configuration settings (see section 43.3) of the audio outputs are transferred from the main power amplifier to the spare power amplifier. The configuration settings of the audio inputs, control inputs and control outputs are not transferred to the spare power amplifier.

Note

It is allowed to connect one spare power amplifier to more than one main power amplifier.

The actual spare switch is carried out by a relay. See figure 8.8 for the situation before spare switching and figure 8.9 for the situation after spare switching. As long as the main power amplifier (1) functions correctly, this relay is energized (see figure 8.8) and the audio is routed to the loudspeaker line (Lsp Out+ and Lsp Out- terminals). The spare amplifier (2) does not route any audio, since it has no connection to any loudspeaker line.

If an LBB4428/00 amplifier has been taken over by a spare power amplifier, the amplifier goes to standby and audio and control inputs do not work. An AVC microphone on the input is set to OFF and the call volume goes to maximum for all the required zones.

If an PRS-1P500, PRS-2P250 or PRS-4P125 amplifier has been taken over by a spare power amplifier, the amplifier goes to stand-by; the audio inputs do not work, but the control inputs and outputs remain active.

Bosch Security Systems 2011-02